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Subjectswitch the remaining architectures to use generic GUP v3
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Hi Linus and maintainers,

below is a series to switch mips, sh and sparc64 to use the generic
GUP code so that we only have one codebase to touch for further
improvements to this code. I don't have hardware for any of these
architectures, and generally no clue about their page table
management, so handle with care.

Changes since v2:
- rebase to mainline to pick up the untagged_addr definition
- fix the gup range check to be start <= end to catch the 0 length case
- use pfn based version for the missing pud_page/pgd_page definitions
- fix a wrong check in the sparc64 version of pte_access_permitted

Changes since v1:
- fix various issues found by the build bot
- cherry pick and use the untagged_addr helper form Andrey
- add various refactoring patches to share more code over architectures
- move the powerpc hugepd code to mm/gup.c and sync it with the generic
hup semantics

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